| CPC B01D 29/15 (2013.01) [B01D 29/58 (2013.01); B01D 2201/0415 (2013.01); B01D 2201/287 (2013.01); B01D 2201/342 (2013.01); B01D 2201/4084 (2013.01)] | 9 Claims |
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1. A method off filtering a fluid, comprising the steps of:
placing a first sealing member in a channel formed in a first collar piece which has a first filter element coupled thereto, the first filter element having a tubular form that is closed at a first end and affixed to the first collar piece at an opposing second end to define an input orifice of the first collar piece;
inserting a second filter element coupled to a second collar piece through the input orifice of the first collar piece and into the first filter element, the second filter element having an overall size smaller than an overall size of the first filter element;
causing the first collar piece to snap-fit engage a flange of the second collar piece the first sealing member sealingly engaging the first and second collar pieces to provide a seal between the first and second collar pieces which are snap-fit engaged with one another;
receiving a fluid in an input orifice of the second collar piece;
passing the received fluid through the second filter element in a first-stage filtering process, to remove contaminants from the fluid; and
passing the fluid which has passed through the second filter element through the first filter element in a subsequent second-stage filtering process, to further remove contaminants from the fluid;
wherein the received fluid flows from the input orifice of the second collar piece and through the second filter element during the first-stage filtering process, and the fluid flows from the second filter element through the first filter element during the subsequent second-stage filtering process.
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